Motor driven rotary tiller



April] 9, 19%.

K. VON MEYENBURG MOTOR DRIVEN RQTARY T ILLER Filed Oct. 8, 1937 Patented Apr. 9, 1940 UNITED STATES PATENT OFFICE MOTOR DRIVEN ROTARY TILLER Konrad von Meyenburg, Basel, Switzerland, assignor to the firm of Motorkultur Aktiengescllschaft, Basel, Switzerland 1 Application October 8, 1937, Serial No. 168,070

' In Germany October 14, 1936 14 Claims. (01. 97-40) (:1;

The present invention relates to a power driven portions shown in elevation of the power takeimplement for breaking up soil especially useful off mechanism illustrated in Figure 5. for agricultural purposes. The invention is par- Referring to the drawing in which similar refticularly directed to a. motor driven rotary tiller erence characters are used for like parts it will 6 which carries its own power and is not provided he noted that this machine comprises a holder 8 with driving wheels. 9 a to which the various elements hereinafter de- As a general rule in power driven rotary tillers scribed are attached and that the major portion the tilling tools will exert a forwardly directed of the weight of the machine is concentrated so pressure due to the reactions arising during opas to act upon a tool shaft 1 (see Figure 1). l eration. When a positive forward feed is dis- On the shaft 1 are positioned the tilling tools g. 10 pensed with as in the present invention then the The holder 1- pp the shaft 1 and also forward thrust of the machine must be secured loses t e dr vi g means 6 for Said shaft. In either from the tilling tools alone or from the o d t s u e a o p c S o S mp e. li h tilling tools in conjunction with the pulling or and cheap c t uction the h lder a is SO 00npushing by the driver or by an animal or by structed as to serve as a compact holder for the 15 motor traction. It is desirable that the tools various essential members of the machine. alone should exert a sufficient forward thrust. The efor e f l wi parts re a t ched to In order to secure this it'is essential that a relae holder A the from? e holder tively large weight should act upon the tool the motor I) is positioned. Also the feeler memsystem. her i is secured to the holder a. At approxi- 20 It is an object therefore of th res nt i v nmately the center of the holder a the tilling tool tion to position the power plant for the machine cover h s secured d below the cover s p s so closely in front of the vertical transverse tiened the i001 Shaft f W t 'the tilling tools 9- plane in which the tool axis lies so that the A150 secured to the holder a is the earth p nemain portion of the entire weight of the machine trating tine l and extending towards the rear is 5 will rest upon the tool system. In this manner Steering arm Directly b v he h lder the forward travel or thrust of the machine may a and secured thereto is the fuel tank 0.

be secured due solely to the tool operation. In Figure 3 an adaptation of the machine is A further object of the machine i t o 130- shown in which a trailer g is coupled to the sition the mainweight of the machine with o de a by the hinge device 2 30 respect to the tilling tool so that such weight In Figures 5 and 6 a further adaptation of the will counteract the tendency of the machine to machine is ShQWIl in Which a frame y T for lift, itself from t ground a power take-off is releasably' connected to the A further object of the machine is to provide side of theholdel positive means which will counteract the lifting T adjust e depth of the 11 d y th tendency f the machine tilhng tools the feeler member i is made adjust- With the above 2Md other Objects in View able in height with relation to the rest of the which will become apparent below the invention machine; Order Secure F W feelel' comprises the combination and arrangement of member 2 13 made admstable helght Wlbh 40 parts hereinafter set forth in detail and shown 5 e the m i The feeler in the drawing in which: i member 2 is pivoted to a pivot 2 (see Figure 1) Figure 1 shows a Side View of the mounted upon the holder at and combined with v adjusting and removing means. By this conoperation struction it is possible to adjust the depth f o 4 fl 2 15 an end View of the tiller in thecutwithout securing any undesirable tilting 46" Figure 3 is a side view of a modified cons truc- A of the machine f th t ti 1 In order to prevent and counteract the tend- W1 9 ear h Dene ng t neremoved' ency of the machine during the operation of the Fleure 4 1s a Dermal cross sectlonal tilling tools to lift itself away from the ground el the Toad Wheels shown in Figurex3 as there is provided an earth penetrating tine Z 50 positioned on the tool shaft. which is located at the bottom of the holder a Fi ure 5 sh ws a s v w of th ma p and which is rovided with an inclined broad vided with a power take-off frame body with the cutting face msloping down forwardly. The forearth penetrating tine removed, and ward edge of the cutting face m cuts in front of Figure 6 is a partial cross sectional view with the cutting curve n of the tilling tools, In this 55 manner the resistance of the solid earth against the tine Z tends to prevent lifting of the machine.

The time Z is also constructed so that it may regulate the forward feed of the machine. Due to the horizontal reaction caused by the tilling tools the machine and the tine Z is pushed forwardly with the tine penetrating into uncut solid ground. As is obvious the tine Z will meet with less resistance in the softer ground and will meet with more resistance in the harder ground. Therefore the tine Z will move further into the softer ground and less into the harder ground. This will regulate the extent of the earth which is pressed to the cut of the tilling tools following. The tine 1 therefore to a very great extent determines the forward speed of-the machine in accordance with the earth resistance.

In order to facilitate the travel of the machine on roads the road wheels so are provided of larger diameter than the tool system. mounted upon the shaft. These are shown in Figures 3 and 4 and may driven by the power plant so as to move the machine forwardly at any speed desired by operator. course be connected with the power plant and in such case as shown the machine is pushed by the operator. 1

In order that the operator may be transported in a speedy manner together with small loads a. trailer q may be hinged to the holder a by the hinge p as shown in Figure 3.

In the present invention a single axle is. provided for the trailer and a single axle is provided for the machine. Furthermore the tiller which pulls the trailer is relatively narrow tracked. Therefore the hinge 32 must permit a lateral swinging of the tiller only in a substantially horizontal plane.

In Figure 5 a frame body 1' for power takeoff is attached to the holder 11 at the point a In order to save the tool shaft 1 from heavy radial loads the shaft ,1" is coaxially coupled with an auxiliary shaft .9 carried in the frame body 1' so that radial forces are transmitted from the shaft 3 to the frame body 7 and thence to the holder 11.

If a speed reduction is desired as for example in winding or in the driving of auxiliary driving wheels then the reduction gear wheels may be mounted by means of a bearing arm u on the rame body r and driven in the same direction as the tool shaft f but at reduced speed. As shown in Figure the bearing arm u may be provided with a supporting leg w for supporting the rear of the machine.

Due to the location of the weight in' the machine described an emcient loading of the reducing gear wheels v is secured which is desirable in plow cable winding and heavy traction surface.

What I claim is:

1. In a rotary tiller, the combination of a central arm-like holder, a rotary tool-shaft borne at the lower end of said holder, rotating tilling tools mounted upon said shaft, a driving-motor carried outside on that holder, all in such a position that the weight-center of the whole is located so far in front of said tool-shaft that during the working process, owing to rearing reaction, the main part of downward adhesion pressure of the tiller is concentrated on the tilling tools, said tilling tools being adapted, owing to said weight positioning, to automatically move the tiller forwardly while cutting, driving means interconnecting said driving motor and said tool The road wheels .1: need not of r shaft, 9. ground engaging member supported by said holder, and a steering arm attached to said holder.

2. In a rotary tiller as set forth in claim 1, means on said holder for adjusting the height of said engaging member.

3. In a rotary tiller as set forth in claim 1, an earth penetrating tine placed so that its edge enters yet uncut earth in front of the tilling tools and thereby holds the tiller down and regulates its forward feed.

i. In a rotary tiller as set forth in claim 1, an earth penetrating tine secured to the lower end of said holder beneath said tool shaft and having a downwardly sloping wide face with a cutting edge positioned in advance of the tilling curve described by the ends of said tilling tools so as to penetrate beneath a strip of solid not yet tilled ground, for the purposes described.

5. In a rotary tiller as set forth in claim 1, road wheels adapted to be mounted on said tool shaft for running on road, said wheels being of larger diameter than the tool system.

6. In a: rotary tiller as set forth in claim 1, a. detachable frame body for taking off power, mounted on said holder.

7. In a rotary tiller as set forth in claim 1, a-detachable frame body mounted on said holder, an auxiliary shaft borne in said frame body coaxially with said tool shaft, means coupling said shafts, a low speed shaft borne by said frame body, and means for driving said low speed shaft from second shaft at reduced speed.

8. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, 2. driving connection between said motor and said shaft and an earth penetrating tine placed so that its edge enters uncut earth in front of the tilling tools and thereby holds the tiller down and regulates its forward feed.

9. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft and an earth penetrating tine secured to the lower end of said holder beneath said tool-shaft and having a downwardly sloping face with a cutting edge positioned in advance of the tilling curve described by the ends of said tilling tools so as to penetrate beneath a strip of solid not yet tilled ground.

10. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, 2. driving motor carried on said holder in such a position that the weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft and. road wheels adapted to be mounted on said tool-shaft, said wheels being able to be driven by said motor.

11. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the Weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft and road wheels adapted to be mounted on said tool-shaft, said wheels being of larger diameter than the tool system.

12. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the weight center of the above part is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft and a detachable frame body for taking off power, mounted on said holder.

13. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft and a detachable frame body mounted on said holder, an auxiliary shaft borne in said frame body coaxially with said toolshaft, means coupling said shafts, a low speed shaft borne by said frame body, and means for driving said low speed shaft from said second shaft at reduced speed.

14. In a rotary tiller the combination of a central arm-like holder, a rotary tool-shaft mounted at the lower end of said holder, tilling tools mounted upon said shaft, a driving motor carried on said holder in such a position that the weight center of the above parts is located in front of the vertical plane containing the axis of said shaft, a driving connection between said motor and said shaft, an earth penetrating tine placed so that its edge enters uncut earth in front of the tilling tools and thereby holds the tiller down and regulates its forward feed and means for adjusting the depth of cut of said tilling tools.

KONRAD VON NIEYENBURG. 

